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目的:探讨拔除1颗下颌切牙矫治Ⅱ类错的适应证和矫治特点。方法:选取34例拔除1颗下颌切牙治疗效果满意的病例,进行矫治前、后模型测量分析和X线头影测量分析,应用SPSS11.0软件包对数据进行配对t检验。结果:大多数患者治疗前均存在一定程度的Bolton指数不调。矫治后,上前牙弓长度减小,上前牙弓宽度增加;上中切牙角(U1-SN)减小,上、下中切牙夹角(U1-L1)增大,下中切牙角(L1-MP)无明显变化。结论:部分上颌需减数治疗的骨性Ⅱ类错患者,可考虑同时拔除1颗下颌切牙,但要严格选择适应证,注意控制上、下切牙唇倾度,协调好上、下牙弓关系,以获得理想的矫治效果。
Objective: To investigate the indications and corrective features of class Ⅱ malocclusion by removing one mandibular incisor. Methods: Thirty-four cases of mandibular incisors were treated with satisfactory results. Before and after treatment, model measurement and X-cephalometry analysis were performed. SPSS 11.0 software package was used for paired t-test. Results: Most patients had a certain degree of Bolton index irregularities before treatment. After correction, the length of the anterior arch of the anterior arch decreased and the width of the anterior arch of the anterior arch increased. The upper and lower incisors (U1-SN) decreased, the angle of upper and lower incisors increased (U1-L1) No significant change in angle (L1-MP). Conclusions: Some patients with skeletal class Ⅱ malocclusion who need reduction in maxillary may consider removing one mandibular incisor at the same time. However, strict indications should be used to control upper and lower incisors’ lip inclination and coordinate upper and lower teeth Bow relationship, in order to obtain the desired effect of orthodontic treatment.